knee high to a duck

referring to when somebody was younger or even when he or she was a child.

high as duck is a term that Lil Durk used in his hit single “Should’ve Ducked” .

“in this verse right here: You come outside without your gun, lil' boy, you dumb as f-ck
Ain’t no quick run to the store, they pop out, fire you up
I told my PO through the gate that I get high as f-ck
She ask me how high do I get, I told her high as Duck”

The term basically means “i’m smoking your dead family members ashes”

Or! “i’m smoking your friends ashes”